This year marks 10 years since Tuppergal and I flew to Alaska with Gary Sobek & Trish Russell. I agree with flying the Alaskan Highway as there are lots of places to land (and we saw planes parked next to cafes along the way). Flight Service is your BEST friend!
Here's the route we flew which also depicts our flight home along 'The Trench'):
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We cleared customs at Spokane Int'l but a couple of months ago we flew into Felts Field (SFF) where I thought I saw a Customs trailer (where you may clear into the USA quicker and get fuel). From there, I recommend the following routing (with fuel stops except 0L4/BTY) into Vegas (which I've flown a couple of times);
Spokane (GEG or SFF), Caldwell (EUL), Winnemucca (WMC), Tonopah (TPH), 0L4 (Goldfield), Beatty VOR (BTY) into Las Vegas. This will keep you clear of the restricted areas along the way.
I learned a LOT on the Alaska trip so check-in offline if there is something I may be able to answer for you. Have a safe flight!
Rosie